// 获取路由URL参数
function urlSearch (parmas) {
  let href = window.location.href
  let query = href.substring(href.indexOf('?') + 1)
  let vars = query.split('&')
  for (var i = 0; i < vars.length; i++) {
    let pair = vars[i].split('=')
    if (pair[0] === parmas) {
      return pair[1]
    }
  }
}

// 深拷贝
function deepClone (obj) {
  let objClone = Array.isArray(obj) ? [] : {}
  if (obj && typeof obj === 'object') {
    for (let key in obj) {
      if (obj.hasOwnProperty(key)) {
        // 判断ojb子元素是否为对象，如果是，递归复制
        if (obj[key] && typeof obj[key] === 'object') {
          objClone[key] = deepClone(obj[key])
        } else {
          // 如果不是，简单复制
          objClone[key] = obj[key]
        }
      }
    }
  }
  return objClone
}

// 防抖
function _debounce (fn, delay = 300) {
  var timer = null
  return function () {
    var _this = this
    var args = arguments
    if (timer) clearTimeout(timer)
    timer = setTimeout(function () {
      fn.apply(_this, args)
    }, delay)
  }
}

// 节流
function _throttle (fn, delay = 1000) {
  var lastTime, timer
  return function () {
    var _this = this
    var args = arguments
    var nowTime = Date.now()
    if (lastTime && nowTime - lastTime < delay) {
      if (timer) clearTimeout(timer)
      timer = setTimeout(function () {
        lastTime = nowTime
        fn.apply(_this, args)
      }, delay)
    } else {
      lastTime = nowTime
      fn.apply(_this, args)
    }
  }
}

/*
* 下划线转换驼峰
*/
function underlineToHump (str) {
  // 如果首字母是_，执行 replace 时会多一个_，这里需要去掉
  if (str.slice(0, 1) === '_') {
    str = str.slice(1)
  }
  return str.replace(/([^_])(?:_+([^_]))/g, function ($0, $1, $2) {
    return $1 + $2.toUpperCase()
  })
}

/*
* 驼峰转换下划线
*/
function humpToUnderline (str) {
  let temp = str.replace(/[A-Z]/g, function (match) {
    return '_' + match.toLowerCase()
  })
  // 如果首字母是大写，执行replace时会多一个_，这里需要去掉
  if (temp.slice(0, 1) === '_') {
    temp = temp.slice(1)
  }
  return temp
}

export {
  urlSearch,
  deepClone,
  _debounce,
  _throttle,
  underlineToHump,
  humpToUnderline
}
